https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119742
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- I've just noticed that the debug mode bitset in <debug/bitset> needs the new constructor added. make check RUNTESTFLAGS="conformance.exp=*bitset* --target_board=unix/-D_GLIBCXX_DEBUG" FAIL: 20_util/bitset/cons/string_view.cc -std=gnu++26 (test for excess errors)